ISR Performance - Race Muffler Delete - Mazda Miata ND 16+ (IS-RCE-NDMD)ISR Performance RC Series Muffler Delete removes the rear muffler and is a quick and clean solution to losing weight, and giving your ND that extra edge at the track. This has not been tested on the ND Club models and may interfere with the bumper cover. Specs 2. 75in stainless steel piping that flares to a 3in tip Gasket included Whats in the box: 1x RC Muffler Delete Pipe 1x 2. 75 exhaust gasket 2x bolts 2x nuts Legal only for use in competition